Locked datafiles

Question

Hello,
I have a problem that when I attempt to open a database I get the following error message:
ORA-27086: unable to lock file - already in use
Linux-x86_64 Error: 5: Input/output error
I've removed the lk<sid>.ora files in $ORACLE_HOME/dbs.
Is there anything else I can do to unlock these files?
I know how this problem started - it was after a database rename, however the database was working fine right until now.

Answer 1

1)Restart the Nfs Server
/etc/init.d/nfs restart
All lock will be freed.
2) if 1) doen't work, use this script to know what sessions are blocking:
select s.username, s.sid, s.serial#,
s.osuser, k.ctime, o.object_name object, k.kaddr,
case l.locked_mode when 1 then 'No Lock'
when 2 then 'Row Share'
when 3 then 'Row Exclusive'
when 4 then 'Shared Table'
when 5 then 'Shared Row Exclusive'
when 6 then 'Exclusive'
end locked_mode,
case
when k.type = 'AE' then 'Application Edition'
when k.type = 'BL' then 'Buffer Cache Management (PCM lock)'
when k.type = 'CF' then 'Controlfile Transaction'
when k.type = 'CI' then 'Cross Instance Call'
when k.type = 'CU' then 'Bind Enqueue'
when k.type = 'DF' then 'Data File'
when k.type = 'DL' then 'Direct Loader'
when k.type = 'DM' then 'Database Mount'
when k.type = 'DR' then 'Distributed Recovery'
when k.type = 'DX' then 'Distributed Transaction'
when k.type = 'FS' then 'File Set'
when k.type = 'IN' then 'Instance Number'
when k.type = 'IR' then 'Instance Recovery'
when k.type = 'IS' then 'Instance State'
when k.type = 'IV' then 'Library Cache Invalidation'
when k.type = 'JQ' then 'Job Queue'
when k.type = 'KK' then 'Redo Log Kick'
when k.type like 'L%' then 'Library Cache Lock'
when k.type = 'MM' then 'Mount Definition'
when k.type = 'MR' then 'Media Recovery'
when k.type like 'N%' then 'Library Cache Pin'
when k.type = 'PF' then 'Password File'
when k.type = 'PI' then 'Parallel Slaves'
when k.type = 'PR' then 'Process Startup'
when k.type = 'PS' then 'Parallel slave Synchronization'
when k.type like 'Q%' then 'Row Cache Lock'
when k.type = 'RT' then 'Redo Thread'
when k.type = 'SC' then 'System Commit number'
when k.type = 'SM' then 'SMON synchronization'
when k.type = 'SN' then 'Sequence Number'
when k.type = 'SQ' then 'Sequence Enqueue'
when k.type = 'SR' then 'Synchronous Replication'
when k.type = 'SS' then 'Sort Segment'
when k.type = 'ST' then 'Space Management Transaction'
when k.type = 'SV' then 'Sequence Number Value'
when k.type = 'TA' then 'Transaction Recovery'
when k.type = 'TM' then 'DML Enqueue'
when k.type = 'TS' then 'Table Space (or Temporary Segment)'
when k.type = 'TT' then 'Temporary Table'
when k.type = 'TX' then 'Transaction'
when k.type = 'UL' then 'User-defined Locks'
when k.type = 'UN' then 'User Name'
when k.type = 'US' then 'Undo segment Serialization'
when k.type = 'WL' then 'Writing redo Log'
when k.type = 'XA' then 'Instance Attribute Lock'
when k.type = 'XI' then 'Instance Registration Lock'
end type
from v$session s, sys.v_$_lock c, sys.v_$locked_object l, dba_objects o, sys.v_$lock k
where o.object_id = l.object_id
and l.session_id = s.sid
and k.sid = s.sid
and s.saddr = c.saddr
and k.kaddr = c.kaddr
and k.lmode = l.locked_mode
and k.lmode = c.lmode
and k.request = c.request
order by object;
And kill them to liberate your process.